Type *#9998*627837793# Go to the 'my parameters' and there you will find new menu where you can unlock phone.(not tested-for samsung C100)To unlock a Samsung turn the phone off take the sim card and type the following code *#pw+15853649247w# .Java status code: #*53696# (Samsung X600)

If you want to unlock your phone put a sim from another company then type *#9998*3323# it will reset your phone. Push exit and then push 7, it will reset again. Put your other sim in and it will say sim lock, type in 00000000 then it should be unlocked. Type in *0141# then the green call batton and it's unlocked to all networks. This code may not work on the older phones and some of the newer phones. If it doesn't work you will have to reset your phone without a sim in it by typing *#2767*2878# or *#9998*3855# (not tested)